Radial pump



Aug. 5, 1952 W. H. MASHINTER RADIAL. PUMP 2 SHEETSSHEET 1 Filed Dec. 8,1948 IN VEN TOR.

Patented Aug. 5, 1952 UNITED STATES PATENT OFFICE a 7 v, 2,605,710

:RADIAL PUMP H William HLMashinter. Chicago, Ill. ApplicationDecember s,1948, Serial. No. 64,075

11 .QlaimS. (Cl. -103.3'7)

7 This invention pertains to pump. mechanism,- injector mechanism; orvatomizing mechanism or'semi-diesel type asa means for introducingthereto theheaviengrade ofv liquid fuels such as are commonly used; inengines'of that type. But

the lighter {fuels employed, the higher operating speeds, and the wider.range of speeds and loads I requiredof gasoline: engines present fuelinjection pr 0blems thatheretofore have never been satisfacorily-solved.

1 An-object of the presentinvention :is tovprovide a fuel injectorpartieularly adapted for-use witlyenginesofthe high-speed type,employing lighter'g-rades of fuel such'asr gasoline.

Another-object is to provide a fuel injector'so organized as to produceafully developed readily combustible fuel spraywithin the very minuteinterval vof time available at high operating speeds.

Another object. of the present invention is to provide a substantiallyleak proof fuel injection pump. 1

Anotherobject is to provide-a fuel injection pump that is substantiallyimmune to leakage producing wear.

Another obj act is to Provide an 3 improved bellows type of pumpcapableof-withstanding high .pressuresover long periodsxof. use.

Another object ofythe invention'is to" provide automatic enrichi gmechanism and: automatic a pump-for supplying fluid under pressure andin measured quantities :to means for utilizing the supplied fluid. aswhere fuel issprayed into the cylinderof an engine, or where otherliquid, such as water, issprayed into such cylinder for. powerorantidetonating reasons.

Another object is to provide injecting means for supplying fuel to,anlinternal combustion engine which may be used with manifold orseparate cylinder injection and wherein the fuelis introduced inproperly atomized condition over thdentirerange .of operation oftheengine, i. e.,

regardless loflthe, operating speedotthe engine.

' Another object -.of-the invention .is to provide an injector--for,;supplying' fuel to .an 'intemal combustion engine, wherein abalanced diaphragm is used as the fuel pumping means;

Another object is to provide injecting-means wherein the amount of fluidsupplied therefrom is controlled by the pressure of the fluid; deliveredto theinjecting means. g H

Another object of the invention isto provide a fuel injector adaptedparticularly-for mewwith engines of a high. speed type, whetheroperating on heavy, intermediate, or light grade fuels,-; it

Another object of the invention isto provide an injector so constructedand arranged that .it is not dependent upon anyparticular shape ofactuating cam; but various shapes of 1 cams :may

be resorted-.110 as desired, to obtain :a suitable variation of injectoroutput with variations in injector speed. of operation (i. e., enginespeed) Another object of. the invention: is to provide an injector soconstructed and arranged that under certain conditions-of operation itdoes-not need, nor is it dependent upon a separate pump for-supplyingfuel thereto;

Another object of the invention is-to provide an .injectorsoconstructedthat it will operate over-a large range of supply pressures.

Another object of the invention isto zprovide a fuel injectorso-constructed and-arranged that a complete degree of load-speed controlis had-by virtue of three independent .controlsover the amount of fuelemitted-per. injection,.that-is, (1;)

and (3) speed or injection operation.

Another object of the invention J is to provide .an injector .using ,acontrolled balanced. diaphragm form of pump -means forinjectionoperation, I a

Another object-is to provide a fuel injector capable of effecting a.moreaccurate control of .mechanicalthrottle, v(2) variable supplypressure the quantity ofrfuel injected throughoutthe-entire range of.engine speeds :and loads;

Another object is :to provide .ina fuelinj'ector improved means formaintaining ithe'isame free of air or other gases.

Another object of the" invention i's 'to p'rovide a fuel injector pumpso constructed and' ar'ranged that it can be regulated to supply 1fuelto: cylinders of an internal combustion engine-"in'a normal'manner,whereby'said'cylinders may-iberfired successively in. their properorder,:or "the pump may be regulated whereby selected numbersof cylinders maybe selectively supplied with "fuel for firing so that in--idling,- orlow powenthe fire occurs less often' .with a. consequent: saving; inwear-on the engine parts and pump;parts.- 1

banks of cylinders are readily controlled, such as controlling thefunctioning or non-functioning of such banks by a throttle, and wherethe timing of the injection may be changed by the throttle.

Another object of the invention is to provide a fuel injectionsystem'wherein the extent of the 1- output 'of individual'cylinders ineach bank may be readily controlled independentlyof the other bank'andwhere the total output of one bank of cylindersmaybe varied nom theoutput of the other.

trolling cam or by means which advances o r-"retardslthe position of theshaft in a rotary direction. 1

Another object of the invention'is' to provide a fuelinjection systemfor an internal combus- 1 tion engine or the like whereinthere'is'provided inixturerati'oadjusting means which is controlled bytemperature variations of the engine such as the temperature of thelubricating oil of the engine or the engine temperature.

Ano'ther object of the invention is to provide a jfuel injection systemutilizing a balanced diar'elieved. 7

Another object of the invention is to provide a phragm so shaped thatstress concentrations are fuel injection system for internal combustionengines or' the like utilizing control cam means wherein wear on the camcannot change the relative output from respective cylinders and whereinthere is substantially no side thrust on 'thecam shaft.

Another object of the invention is to provide a pump such as a pump forpumping fluids'which is'not limited to any known field but isadapted foruse in a wide range of fields, such as that 'of air conditioning, fuelinjecting, handling of slurryrorthe like, and wherein the same pumpingunit is adapted to handle different types of fluids without multiplyingthe parts thereof. 4 Another object of the invention is to provide apumping unit wherein one pumping element can be readily removed withoutaffecting the others andiwherein the pumping elements are replaceablewithout the necessity of recalibrating the entire unit."

Another object of the invention is to provide a pump. constructionwherein no calibration is necessary. 1 v Y .Another object oftheinvention is to provide a, fuel injecting system for an internalcombustionengine whereinbanks of cylinders of the en-- ginei may be usedto fire alternately so that the cylinder'wear is distributed.

Another object of the invention is to provide a pumping device for aninternal combustion engineer the like wherein the drive for the pumpingelement can be the same as the'ignition drive but the timing of the unitand that of the ignition can be adjusted independently, one with respectto the other.

With these and various other objects in view, the invention may consistof certain novel features of construction and operation as will be morefully described and particularly pointed out in the specification,-drawings and claims appended hereto.

In the drawings which illustrate embodiments of the device and whereinlike reference characters are used to designate like parts Figure 1 is asectional elevation through one form of fuel-pump embodying theinvention;

Figure 2'is a fragmentary sectional plan view takensubstantially' in theplane as indicated by the line 2-2 of Figure 1;

Figure 3 is a fragmentary sectional plan view taken substantially in theplane as indicated by the line 33 of Figure 1; l

Figure 4 is a-diagram showing the injection of fuel into successiveengine cylinders and the successive'firing ofsaid cylinders controlledby the position oflthe pump cam of the pump illustrated in Figure 1; s

Figure 5 is a sectional elevation of a modified form of fuel pumpembodying the invention; and

Figure 6 is a sectional plan view'takensubstantially in the plane asindicated-by the" line 6- 6 of Figure 5. 1

Referring first of all, more-particularly, to the pump illustrated inFigures 1 to 3 inclusive, the pump comprises a body portion In, andas-the pump illustrated is for supplying fuel to-"a six cylinderinternal combustion engine, the pump body may conveniently be ofhexago'nal form.

The body "I I) is provided with the bore l2 closed by the top and bottomend closures I4 and I6 forming a cam shaft recess. The body portion Illis provided with the pedestal l8 to which the control lever 20 ispivoted as at 22. The control lever comprises the arm 24 connected tosuitable operating means (not shown) and the opposite arm 26 of saidlever is loosely pivoted as at 28 to the cam shaft 30, wherebyoscillation ofthe lever'2U raises and lowers the cam shaft 30 in acontrolled manner. The cam shaft passes through a bearing portion 32 in'the upper end closure l4, and within the bore 12 the shaft is providedwith the cam portion 34. In the embodiment shown, the cam shaft isadapted to make one revolution for each seven revolutions of the crankshaft of the engine to which the pump supplies fuel, the engine beingtwo-stroke cycled, hereinafter called two cycle.

The cam is provided with seven stages, for the purpose to be laterdescribed, said stages being indicated at 36, 38, 40, 42,44, 46 and 48.The top stage 36 is provided with seven lobes 50, 52, 54, 56, 58, 60 and62 (Figure 2), and successive stages 38, 40, etc., are provided with oneless lobe. For example, stage 38 is provided only with'lobes 50, 52, 62,6D, 56 and 56; stage 40 as illustrated in Figure 3 is provided withlobes 50, 52, 54,62, 58 and 56; stage 42 is provided with lobes 50, 52,60, 58 and 56; stage 44 is provided with lobes 56, '52, 60 and 56; stage46 is provided with lobes 50, 52 and 56, and stage 48 isprovided withlobes 50 and 52.

Cam portion 34 abuts against a springseat 64 for one end of the spring66, the lower end of said spring seating on spring seat 68 of the lowerend enclosure. A portion of the cam shaft 30 extends through the bearingportion l0 of the closure [6 and is provided with a helical or spiralspline 12,

housings.

cureda-by the pump housing end- II6. "course, understoodthat-while thefiat diaphragm II-.2 is illustrated, any-other :form. of pulsatingpressure.

:zgpomm which; engages with complementary -'spline;means provided on:the drivel'shaft coupling p14, said coupling being rotated by asuitable drive shaft, not ;shown,' driven by the "engine, Such"; as theignition-ortiming; shaft. .iTheDhousing I0 is suitably supported :as at'16 with respect to the engine; through a support 18.

Adjustable means 80'is provided for initially adjusting the timing ofzithe cam shaft, and said :means may conveniently take the form :of alug I.02: provided withsa suitable slot through which .thehousing I 0%maybefixed by means of the bolt 04. This; then, relatively, positions thesplines, one'with-respect tovthe other.

The body is provided with equallyspacedzhy- :draulic pump housingstt;which, inthesembodiment shown, are six in number. As'-.each--,-of thehousings and their connections are similar, it will only be necessaryto. describeone of such The housings 66 :arepreferably corplanar,

' being: located about mid-way of the depth 0f" the "hose I2, and eachhousing 86-is secured asby threads 88 to'the' housing I 0 and isprovided-with the enlarged bore 90. A plunger or: follower 32 extendsthrough passageil l provided in'the'hous- 'ing I0'andis provided atitsinner-end 96 with a spring seat 96 for the spring 1 I00, the oppositeendof the springseating on seat I02-of saidbore.

The outer or opposite'end l-Mof'said plunger is.

the cam engaging end, and in the embodiment shown-is of the mushroomtype, though itmay be-understood, of course, that any-type maybe used.

Housing 06,; provided with-a bleed ventyplug -I 06 to .bore fill isprovidedwith the smaller bore I08 which communicates .at' one end-withboretil and at the other" end with ;the diaphragm recess -I I0.Asuitable diaphragm- I I2--is secured in position by-meansof thecollar-H4 which in turn is se- It is, of

member maybe used, such as a collapsible bellows orthe like, suchasillustrated in application Serial No. 541,969, which issuedas-PatentN'o. -.2-,559,364 on July 3, 1951. Diaphragmrlm is preferably made of aflexible, resilient material which .is chemica'lly inert to petroleumproducts 'or to'the product being pumped and the hydraulicfiuid,--such-as synthetic rubber; plastics as" Teflon (tetrafluoroethyli-ne) ,methyl acrylate,

or metals as 18-8 stainless -steelor Hastellcy (a nickel, chromium,molybdenum, iron alloy) '0 and -B, and the diaphragm may-beysuch asshown and illustrated in anapplication filed of: even date herewithSerial .No. 64,076.

Check ,valve fitting I8 is secured a at I20 'tothe. housing '86,thespring pressed valve I22 seating onseat I24, spring I26 urging saidvalve toward closed position, one end-of the spring being seated on thevalve and the other end of the springbeing seated on perforated fittingI26. A

--tube:such as anoil tube I30 is secured as at I32 to the-fitting H8,andis connected toany. suitable source of supply, preferably underslight The collar II-4 and closure H6 form anouter fuel chamber I34 withthe diaphragm H2, and closure H6 is connected tothe fuel inlet checkvalve fitting I 36 provided-with the valve I38 seated towardthe flow offuel, tha-tis; seated on seat I40,- fuel-supplyline I02 being connectedtosaid'fi'tting I36 as at I46;

The valve is urged toward closed positioniby means .of the spring" I 46seated on perforated fitting I48. Fuel supplied past the check valveI38, is suppliedto chamber. I34, by passages I50 and I 52,;;and:;passageI50 communicates with the outlet check valve fitting I I 54 1 providedwith the check valve I56seatedtoward thepassage I50,

I being urged ftoward closed position onv seat ,,l 51

bygmeans of the spring Mil-seated onthe perforatedi'fitting 160.FittingsIZfl, I48 and I60 are adjustable whereby thetension of therespective springs which are seated thereon may be varied.

' Thefloutletsupply line' I62 is 'securedto the fitting; IEl-asrat I-64and said line I62 is securedto a suitablenozzle forsupplying fuel toa-cylinder ofkansinternal combustion engine, such as shown in"application .Serial No. 617,752, filed September 21, ,1945101'; SprayNozzle, now Patent-No. 2,555,803. I Each-of. the-separatev hydraulic.pumps are connectedina similar manner-to their respective cylinders;

In operation of this. form-01f thedeviceyletit be-passumed that the ,camshaft 30,1is depressed smthat stage 36engages the followers 92.. In

this stagev the pumps will be successively operated, that is,eachfollower will be moved against its spring I00 by contact with thelobesv 50, etc., causing displacement of'liquid in the respectivehydrauliopump housings 86, which in turn actuates'the respectivediaphragms II2 whereby reciprocation of the diaphragms causesa pumpingaction ofthe fuel supplied to the'respectivecylinders.

If it is desired. to clecreasethe throttle, thecam shaft 30 israised-to:the selected stage. For example, let it be assumed that the. camshaft is raised so that the followersjcontact coursegdil. .In'this caseonly one lobe is utilized.- Inasmuch as there are seven. lobes: and sixcylinders, the actuation will be {as illustrated in Figurev 4.

Let'it-be. assumed-that engine cylinder numher I I. to'be-aifected isindicated by station I 6'5, successive engine cylinders numbers 2, 3, 4,5. and, 6 being shown atstations I6B,.I'I0, I72, I14 and H6. -Let:it-beassumed that the" fuel injection pumps for the respectivecylinders'are also :at

166, "I68, etc., number one cylinder will fire-at I18 vandtheenginecrank shaft will then rotate through 360, plus 60 and'cylinder number 2will fire at I80. While thecrank shaft was going through-420, the camshaft 30 rotated through 60. The crankshaft then. rotatesthrough'another 420rwhereby cylinder. number; 3 fires at I82. Cylindernumber 4 fires 420 later at I8 1.

LCylinders'numbers 5 and 6 fire 420 at 840, at I86. and I68,respectively,-and for each 420 of thecrank shaft the cam shaft rotatesthrough .60.

Thus the cylinder'wear is distributedwhile idling-(minimum throttle).

It is understood that if six lobes were used on the cam shaft instead ofseven, the cam shaft in the lowest idlingposition would run at the speedofzthe crank shaft, that is at stage 48, only one'and the same cylinderwould fire each time instead of successive cylinders, such as whereseven lobes are used. Each cam lobe and each cam stage is so shaped thatas the cam shaft is being moved downwardly to cause successivecylinders'to be brought into operation, the mixture to the opera'tingcylindersis first enriched up to the time that the followers changestages, at Which'time the lobes in the newly entered stage cause-themixture to get leanerso thattheefiect of causing cylinders to becomexop'erative is a gradual one, from onestage to the other, thus causingasmooth DOWBPfiOW. The shapeof the lobes in .the embodiment illustrated.is thus flared or tapered upwardly on each side of the center ofthe'lobe, such as shown at I88 (Figure 2).

Also, it will be noted that as the cam shaft 38 is raised or lowered thespline 12 causes a change of relative position between shaft 38 and thedriving shaft of coupling 14, whereby the injection time is advanced orretarded, depending upon the shape of the spline and the stage engaged,and type of service to which the engine is put.

Referring now to the construction illustrated in Figure 5, the devicecomprises the housing I 82 provided with the connection I84 secured in asuitable support I86, the position of the'housing being adapted-to beadjusted as by adjusting means I88, which may conveniently take the formof the base plate I98, having a suitable slot through which the bolt I92extends.

The housing is provided with the bore I94 closed by the top closureI96,. said closure being provided with the bearing I98 through which oneend of the cam shaft 288 extends. A pedestal 282 is provided on thehousing, and the lever 284 is pivoted thereto as at 286. The lever, asshown, is in the form of a bell crank provided with the arm 288 to whichthe operating means 2I8 is adjustably pivoted as at 2I2. The lever isprovided with the arm 2I4 adapted to engage the outwardly projecting endof the cam shaft 288 for controlling the position of said shaft, the endof the shaft being shown as a button 2I6 resiliently mounted on spring2I8 disposed in recess 228 of the cam shaft. The lower end of the shaft288 extends through the bearing portion 222 of the housing and isprovided with the tang 224 received in a suitable slot 226 in the driveshaft 228. A spring 238 is disposed to seat at one end on the springseat 232 and at the other end on the antifriction bearing 234 for urgingthe cam shaft upwardly.

In the embodiment shown, the device is adapted to be operative to causeoperation of certain selected cylinders and in this case the pumpingelements are placed intwo banks or courses. For example, the pumps forcylinders I, 3 and 5 are in one course and the pumps for cylinders 2, 4and 6 are in another course. The pumping ele ments in each course aresimilar.

Referring first of all to the upper course, a gasoline-inlet manifold236 is supplied from a suitable source, not shown, and is secured as at238 to the housing I82. Said manifold communicates through passage 248with the inlet valve 242 seated toward the manifold, being springpressed as at 244 and provided with the spring adjusting and retainingmeans 246 apertured to permit passage of fuel therethrough. The valvecommunicates through passage 248 with the fuel diaphragm chamber 258,which in turn communicates through passage 252 with the outlet valve254, the valve being adapted to be secured to suitable piping (notshown) for supplying the proper cylinder, as for example cylinder num--ber I.

A check valve 256 is provided seating against the flow, being urgedtoward closed position by the spring 258 which in turn is retained bythe apertured retaining and adjusting member 268. The diaphragm 282 iscupped shape, sealed and bonded to the ring 264 formed on the member266. The inside of the diaphragm communicates through passage 288 withthe bleed plug 218. The inside of the diaphragm also communicatesthrough'passage 212 with the passage 214 which in turn communicates withpassage 216, -a check valve 218 seating towardpassage 216 whereby oilcontained in the bore I94 may be supplied past the check valve 218 whichcloses toward the bore I94 to the inside of the diaphragm 262. The valve218 is spring pressed by spring 288, the spring being seated on theapertured retainer and adjusting members 282.

A plunger 284 is mounted in passage 286, which is aligned with passage2,12, and said plunger is provided with the roller follower 288 pivotedto the housing 298 provided on the plunger 284, the spring 292 urgingthe follower towardthe cam lobe 294. The cam lobe 294 is bevelled andshaped as illustrated in Figure 6 whereby the roller 288 always contactsthe cam 294 over a line contact.- v

Cam lobe 296 is similar to cam lobe 294, and assumingthat the pumpillustrated for the lower course is shown for cylinder number 4, thelobe is spaced from lobe 294.

/ Manifold 236 is secured as at 388 to the housing and communicates withspring pressed check valve 382 similar to check valve 242 closing towardmanifold 236. The check valve communicates with fuel chamber 384 formedby threaded plug 386 retained by cap 388. The chamber 384 communicateswith passage 3I8 which communicates through check valve 3I2, similar tocheck valve 254, and suitable piping (not shown) with cylinder number 4,check valve 3I2 seating toward the chamber 384. The diaphragm 3I4,similar to diaphragm 262, is bonded to collar 3I6 which is part ofmember 3I8, and the inside of the diaphragm communicates through passage328 with the check valve 322 which in turn communicates with the boreI94, check valve 322 being provided with the ball 324 which seats towardthe bore I94, being spring pressed by spring 328, the spring beingretained by the apertured adjusting and retainer member 328. The insideof the diaphragm also communicates through passages 338 and 332 withbleed vent plug 334. The plunger 336 is spring pressed by spring 338 andreciprocates in passage 348, aligned with passage 328, the spring urgingthe housing member 342 toward the cam 296, the housing being providedwith the bevelled follower roller 344.

Below the cam 296 there is provided 'a cam lobe 346 which is operativewhen cam lobes 294 and 296 are in inoperative raised position wherebyonly the lower banks of cylinders are supplied with fuel. Operation ofthe lever 284 causes vertical movement of the cam shaft 288 to disposethe cam surfaces 294 and 296 in operative relation with the followers,as illustrated in Figure 5, or the cam shaft may be moved to a positionwhere follower 288 is inoperative, as where it contacts the cylindricalportion 348 of shaft 288, and follower 332 is operative by the cam 346.

When the follower 344 is operative by the cam 346, and it is desired tocause operativeness of the other bank of cylinders, the lower banks ofcylinders are first enriched by cam 346 due to the shape of said cam,and as the cam shaft 288 is depressed the roller follower 344 willtravel down the slope 358 so that when the upper bank of cylindersbecome effective with the lower banks of cylinders, that is, when therollers 344 and 288 engage cams 298 and 294, respectively, the sixcylinders will be lean so that a gradual flow of powder will result.Operation of the followers, of course, causes oscillation of thediaphragms, causing a pumping action from the manifold 236 to the outletfittings and thus to .illustration and not limitation as various andother forms of the device will, of course, be apparent to those skilledin the art without departing from the spirit of the invention or thescope of the claims.

I claim:

1. In a pump, the combination of a housing having a lubricant containingcam shaft recess therein, a cam shaft disposed in said recess and havingan end projecting from each end of said housing, means connected to oneend of said shaft for bodily moving said shaft, means operativelyconnected to the other end of said shaft for rotating said shaft, aplurality of courses of cams on said shaft within said recess, said camscomprising cam lobes, the number of cam lobes in each course beingdifferent from the number of lobes in the other courses, and a pluralityof pumping elements disposed in said housing radially of the axis ofsaid shaft, each of said pumping elements having a plunger adapted to beselectively reciprocated by the cams of the respective courses.

2. In a pump, the combination of a cam shaft, means for rotating saidshaft, a plurality of courses of cams on said shaft, a plurality ofpumping elements, means for operating said pumping elements including areciprocable cam follower for each of said elements, and means foreffecting an engagement of said followers and a selected course of cams,whereby the cams in the other courses are inoperative to actuate saidpumping elements.

3. In a pump, the combination of a cam shaft, means for rotating saidshaft, a plurality of courses of cams on said shaft having facesinclined longitudinally with respect tothe axis of rotation of saidshaft, a plurality of pumping elements, means for operating said pumpingelements including a reciprocable cam follower for each of saidelements, and means for effecting an engagement of said followers and aselected course of cams, whereby the cams in the other courses areinoperative to actuate said pumping elements.

4. In a pump, the combination of a cam shaft, means for rotating saidshaft, aplurality of courses of cams on said shaft, a plurality ofpumping elements, means for operating said pumping elements including areciprocable cam follower for each of said pumping elements, and

means for effecting an engagement of said followers and selected coursesof cams, whereby the cams in the other courses are inoperative toactuate said pumping elements.

5. In a pump, the combination of a cam shaft, means for rotating saidshaft, a plurality of courses of cams on said shaft, said camscomprising cam lobes, the number of cam lobes in each course beingdifferent from the number of lobes in the other courses, a plurality ofpumping elements disposed radially of the axis of said shaft, means foroperating said pumping elements including a reciprocable follower foreach of said elements, and means for bodily moving prising 6am dupes,-he

each 'cou'rs'e bein'g'dift s. weather sour, inclined-longitudinally threspect to the axis of said shaft, a pluralityof pumping elementsdisposed radially ortrie axisofsaidshaft, means forT 'operating saidpumping' elem'ents includi a reciprocable cam follower mr eacnpr saidtpumping elements, said followers being adapted. for movement in a planeat right angles to the axis of said shaft, and means for moving saidshaft axially to selectively engage said followers with a course of saidcams.

'7. In a pump, the combination of a cam shaft, rotating means for saidshaft, a plurality of courses of cams on said shaft, a plurality ofpumping elements, means for operating said pumping elements includingreciprocable cam followers disposed radially of the axis of said shaft,and means for moving said shaft axially for effecting an engagement ofsaid followers and a selected course of cams, whereby the cams in theother courses are inoperative to actuate said pumping elements and toalter the relative position of said shaft with respect to said rotatingmeans.

8. In a pump, the combination of a cam shaft, means for rotating saidshaft, a plurality of courses of 'cams on said shaft, a plurality ofcourses of pumping elements disposed radially of the axis of said shaft,means for operatingsaid pumping elements including a reciprocable camfollower for each of said pumping elements, and means for. selectivelyengaging one or more courses of cams with one or more courses offollowers.

9. In a pump, the combination of a housing having a lubricant containingcam shaft recess therein, a cam shaft disposed in said recess and havingan end projecting from each end of said housing, means connected to oneend of .said shaft for axially moving said shaft, means operativelyconnected to the other end of said shaft for rotating said shaft, aplurality of courses of cams on said shaft within said housing, aplurality of pumping elements disposed in said; housing radially of theaxis of said shaft in a plurality of planes, and means for operatingsaid pump elements including a reciprocable cam follower for each ofsaid pumping elements adapted to be selectively engaged and disengagedby the courses of cams.

10. In a pump, the combination of a cam shaft, means for rotating saidshaft, a plurality of courses of cams on said shaft having facesinclined longitudinally with respect to the axis of rotation of saidshaft, a plurality of pumping elements, means for operating said pumpingelements including a reciprocable cam follower for each of said pumpingelements adapted for movement in a plane at right angles to the axis ofsaid shaft, and means for effecting an engagement of said followers anda selected course of cams, whereby the cams in the other courses areinoperative to actuate said pumping units.

11. In a pump, the combination of a cam shaft,

means adjustably connected to said shaft for rotating the same, aplurality of courses of cams on said shaft, a plurality of pumpingelements, means for operating said pumping elements in- 11 eluding a,reciprocable cam follower for each of said pumping elements, and meansfor bodily, moving said shaft for efieeting an engagement or-Tsaidfollowers anqa selected course of cams whereby the cams on the othercourses are inop erative to actuate 'sa-id pumping elements and to alterthe relative position of said shaft with respect to said rotating means.

" WILLIAM H. MASHIN'I'ER.

REFERENCES CITED Number 12 UNITED STATES PATENTS Name te Mahler Dec. 3,1929 Muller Jan. 24, 1933 Woolson May 9, 1933 Rassbach et al. July 17,1934 Johnson Sept. 25, 1934 Godiriaux June 29, 1948

